High sensitivity carbon nanotube tower electrodes

2006 ◽  
Vol 120 (1) ◽  
pp. 298-304 ◽  
Author(s):  
YeoHeung Yun ◽  
Vesselin Shanov ◽  
Mark J. Schulz ◽  
Zhongyun Dong ◽  
Abdul Jazieh ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
High Sensitivity

scholarly journals Highly-Sensitive Textile Pressure Sensors Enabled by Suspended-Type All Carbon Nanotube Fiber Transistor Architecture

Micromachines ◽  
2020 ◽  
Vol 11 (12) ◽  
pp. 1103
Author(s):  
Jae Sang Heo ◽  
Keon Woo Lee ◽  
Jun Ho Lee ◽  
Seung Beom Shin ◽  
Jeong Wan Jo ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Pressure Sensor ◽  
Pressure Range ◽  
Pressure Sensors ◽  
High Sensitivity ◽  
Low Pressure ◽  
Electronic Textiles ◽  
Carbon Nanotube Fiber ◽  
Cnt Fiber ◽  
Walled Carbon Nanotubes

Among various wearable health-monitoring electronics, electronic textiles (e-textiles) have been considered as an appropriate alternative for a convenient self-diagnosis approach. However, for the realization of the wearable e-textiles capable of detecting subtle human physiological signals, the low-sensing performances still remain as a challenge. In this study, a fiber transistor-type ultra-sensitive pressure sensor (FTPS) with a new architecture that is thread-like suspended dry-spun carbon nanotube (CNT) fiber source (S)/drain (D) electrodes is proposed as the first proof of concept for the detection of very low-pressure stimuli. As a result, the pressure sensor shows an ultra-high sensitivity of ~3050 Pa−1 and a response/recovery time of 258/114 ms in the very low-pressure range of <300 Pa as the fiber transistor was operated in the linear region (VDS = −0.1 V). Also, it was observed that the pressure-sensing characteristics are highly dependent on the contact pressure between the top CNT fiber S/D electrodes and the single-walled carbon nanotubes (SWCNTs) channel layer due to the air-gap made by the suspended S/D electrode fibers on the channel layers of fiber transistors. Furthermore, due to their remarkable sensitivity in the low-pressure range, an acoustic wave that has a very tiny pressure could be detected using the FTPS.

Comparison between Carbon Nanotube-Based, Graphite-Based, and Rice Hull Carbon-Based Electrodes with Rice Hull Silica as Catalyst for Electrochemical Detection of Copper

2018 ◽  
Vol 775 ◽  
pp. 283-288
Author(s):  
Leandre Emile D. Apostol ◽  
Jose Victor O. Sacueza ◽  
John Paul Klien Zeus S. Visaya ◽  
Franz Kevin B. Manalo ◽  
Emmanuel A. Florido
Keyword(s):  
Carbon Nanotube ◽  
Copper Chloride ◽  
Copper Ion ◽  
Electrical Characterization ◽  
High Sensitivity ◽  
Electrode System ◽  
Rice Hull ◽  
Voltage Response ◽  
Ion Sensing ◽  
Voltage Relationship

This study aimed to determine the copper ion-sensing ability of a carbon nanotube (CNT)-based sensor with carbonized rice hull (CRH) as catalyst. The 50:50 CNT-CRH electrode was compared to 100% graphite, 100% CRH, 100% CNT, 50:50 graphite-CRH, and 70:30 graphite-CRH electrodes. Copper chloride (CuCl2) concentrations of 0.01M, 0.02M, 0.03M, 0.04M, 0.04M, 0.05M, 0.06, 0.07M, 0.08M, 0.09M, and 0.1M were used to test the response of the electrodes. Five trials were done for each concentration. The 50:50 CNT-CRH electrode exhibited good sensor characteristics such as high sensitivity, low resolution, and high correlation in concentration-voltage relationship. Electrical characterization using three-electrode system showed a linear relationship between the concentrations and voltage response. The 50:50 CNT-CRH electrode exhibited a sensitivity of 0.0619 V/0.01M or 9.7 mV/100ppm and a resolution of 10 ppm/1mV. The electrode also exhibited a high correlation R2 value of 0.933.

Uniform DNA Biosensors Based on Threshold Voltage of Carbon Nanotube Thin-Film Transistors

NANO ◽  
2016 ◽  
Vol 11 (05) ◽  
pp. 1650060 ◽  
Author(s):  
Yanyan Deng ◽  
Min Zhang ◽  
Fang Yuan ◽  
Zigang Li ◽  
Wenyu Zhou
Keyword(s):  
Thin Film ◽  
Carbon Nanotube ◽  
Standard Deviation ◽  
Threshold Voltage ◽  
Thin Film Transistors ◽  
High Sensitivity ◽  
Dna Biosensors ◽  
High Uniformity ◽  
First Time ◽  
Highly Uniform

Uniformity is a key parameter to assure the accuracy of biosensor devices. In this work, highly uniform carbon nanotube thin-film transistors (CNT-TFTs) with a standard deviation of threshold voltage ([Formula: see text]) as small as 0.04 were achieved by accurately controlling the fabrication process, which is so far the most stable distribution to our knowledge. On-state current ([Formula: see text]), off-state current and on/off current ratio also exhibit high uniformity with low standard deviation of 0.50, 0.72 and 0.54, respectively. Given the high uniformity, high stability and high sensitivity, the CNT-TFTs are used as ultra-sensitive 5-hydroxymethyl cytosine (5-hmC) detecting devices for the first time, which is one of the important modified bases in DNA and plays an important role in epigenetics. After attachment of 5-hmC DNA, a reproducible and stable shift of 18.7–59% in [Formula: see text] as well as a 31–54% change in [Formula: see text] were observed in the transfer characteristics curves of CNT-TFTs. Thus, a detecting device of 5-hmC in DNA segments could be designed based on the highly uniform CNT-TFTs.

Electrical Properties of Polyaniline and Multi-Walled Carbon Nanotube Hybrid Fibers

2007 ◽  
Vol 7 (11) ◽  
pp. 4185-4189
Author(s):  
Yu Jin Kim ◽  
Min Kyoon Shin ◽  
Seon Jeong Kim ◽  
Sung-Kyoung Kim ◽  
Haiwon Lee ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Electrical Properties ◽  
Electrical Conductance ◽  
Microscopic Analysis ◽  
High Sensitivity ◽  
Fiber Axis ◽  
Hybrid Fibers ◽  
Electron Microscopic ◽  
Multiwalled Carbon ◽  
Hybrid Nanofibers

We have fabricated for the first time one-dimensional multiwalled carbon nanotube (MWNT) nanocomposite fibers with improved electrical properties using electrospinning. Polyaniline (PANi) and poly(ethylene oxide) (PEO) were used as a conducting and a nonconducting matrix, respectively, for hybrid nanofibers including MWNTs. The hybrid nanofibers fabricated by electrospinning had a length of several centimeters and a diameter ranging from ∼100 nm to ∼1 μm. Transmission electron microscopic analysis confirmed that the MWNTs were successfully oriented along the fiber axis without any severe aggregation during electrospinning. The hybrid nanofibers showed an enhanced electrical conductance with increasing MWNT content up to 0.5 wt%, and compared to PANi/PEO fibers, they also showed a stable linear ohmic behavior. These hybrid conducting nanofibers can be applied to chemical and biosensors that require a high sensitivity.

Fast-speed, high-sensitivity polyimide humidity sensors with superhydrophilic carbon nanotube network electrodes

2013 ◽  
Vol 185 ◽  
pp. 97-104 ◽  
Author(s):  
Myung Jin Lee ◽  
Hyun Pyo Hong ◽  
Kwang Ho Kwon ◽  
Chan Won Park ◽  
Nam Ki Min
Keyword(s):  
Carbon Nanotube ◽  
High Sensitivity ◽  
Humidity Sensors ◽  
Fast Speed ◽  
Carbon Nanotube Network

A Lab-on-a-Chip Device Using a Dielectrophoresis-Aligned Carbon Nanotube Sensor Array

2011 ◽  
Author(s):  
Pengfei Li ◽  
Nan Lei ◽  
Jie Xu ◽  
Wei Xue
Keyword(s):  
Carbon Nanotube ◽  
Sensor Array ◽  
Uv Light ◽  
Lab On A Chip ◽  
High Sensitivity ◽  
Metal Electrodes ◽  
Flow Sensors ◽  
Single Walled Carbon Nanotube ◽  
Ph Values

Here we report the design, fabrication, and characterization of a lab-on-a-chip device using a nanotube-based sensor array. The microfluidic components are composed of an ultraviolet (UV) light-defined, cross-linked SU-8 microchannel and a polydimethylsiloxane (PDMS) top cover. The hybrid microfluidic structure provides a fully sealed microchannel, well-aligned features, and precisely positioned nanosensors. Well-organized single-walled carbon nanotube (SWNT) thin films are deposited and aligned across the electrodes on a silicon substrate with dielectrophoresis. The assembly of SWNTs is carried out in a sealed microchannel. The SWNT devices are configured as two-terminal resistor-type sensors with the metal electrodes as the probing pads and the dielectrophoretically captured SWNTs as the sensing elements. The SWNT devices are used as integrated flow sensors to monitor the flow rate in the microchannel. In addition, when exposed to aqueous solutions with various pH values, these sensors change their resistance accordingly and demonstrate high sensitivity towards pH solutions.

High-Sensitivity Bolometers from Self-Oriented Single-Walled Carbon Nanotube Composites

2011 ◽  
Vol 3 (8) ◽  
pp. 3200-3204 ◽  
Author(s):  
Gustavo Vera-Reveles ◽  
Trevor J. Simmons ◽  
Mariela Bravo-Sánchez ◽  
M. A. Vidal ◽  
Hugo Navarro-Contreras ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
High Sensitivity ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Nanotube Composites ◽  
Carbon Nanotube Composites

scholarly journals Comparison of Duplex and Quadruplex Folding Structure Adenosine Aptamers for Carbon Nanotube Field Effect Transistor Aptasensors

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2280
Author(s):  
Hong Phan T. Nguyen ◽  
Thanihaichelvan Murugathas ◽  
Natalie O. V. Plank
Keyword(s):  
Carbon Nanotube ◽  
Field Effect ◽  
High Performance ◽  
Field Effect Transistor ◽  
Dissociation Constants ◽  
High Sensitivity ◽  
Quadruplex Structure ◽  
G Quadruplex ◽  
Effect Transistor ◽  
Folding Structure

Carbon nanotube field effect transistor (CNT FET) aptasensors have been investigated for the detection of adenosine using two different aptamer sequences, a 35-mer and a 27-mer. We found limits of detection for adenosine of 100 pM and 320 nM for the 35-mer and 27-mer aptamers, with dissociation constants of 1.2 nM and 160 nM, respectively. Upon analyte recognition the 35-mer adenosine aptamer adopts a compact G-quadruplex structure while the 27-mer adenosine aptamer changes to a folded duplex. Using the CNT FET aptasensor platform adenosine could be detected with high sensitivity over the range of 100 pM to 10 µM, highlighting the suitability of the CNT FET aptasensor platform for high performance adenosine detection. The aptamer restructuring format is critical for high sensitivity with the G-quadraplex aptasensor having a 130-fold smaller dissociation constant than the duplex forming aptasensor.

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